Replacement of stock airbox
 

What's a good inexpensive intake kit to replace original stock box? Thanks in advance.

A used stock airbox. I'm sure you can find one in the 3rd gen parts for sale section.

I like M2, there are couple of them in the FS section right now.

My stock box is fine im looking to upgrade

If your stock box is fine, modify it. You wont find a better intake than a modified stock box. Pm me if you want a Cheap Bastard Kit for your stock box.

This.

Works just as good as the M2 or SR Motorsports' replica of the M2 airbox.

What is the cheap bastard kit? How much does it run for?

You essentially remove material at the bottom of the airbox, so that you can take fresh air from a more direct source, that which being the front-end.

The benefit is that you'll very likely get faster spool and slightly higher boost (somewhere around 0.5-1psi) gained.

You can also make a shield so that you're not sucking in radiant heat from that side of the rad and coolant hose.


IIRC, someone has a free PDF of the template of the shield so that you're not spending too much time where someone else already went through the trouble.



The only time that I recommend getting an aftermarket airbox/intake setup, is when running a larger SMIC.
As an aside, I do recall someone selling a PDF template of a cloned aftermarket airbox that you can make yourself. Can't remember who is selling it though as its been quite a while.

Either way, they're both cheaper alternatives to the M2 Airbox and its replica's found in the classifieds as those usually go for about $200+ And finding one brand new is about $400+


EDIT: Found the thread with the info
https://www.rx7club.com/3rd-generati...ox-mod-121491/

EDIT2: https://www.rx7club.com/3rd-generati...intake-628764/

In addition to the cheap bastard airbox mod, another improvement I made is to then block off the air that is siphoned to the airbox, from the intercooler duct.

Only with the cheap bastard intake mod, does this eliminate 2 things:

*at idle, while stopped in traffic, there is no airflow into the front of the car, or into the intercooler duct. So hot engine bay air flows backwards through the stock intercooler core, into the intercooler duct, and it is then sucked up by the airbox. This stops that.

*At speed (with the intercooler duct separated from the rest of the system) cold air is going straight into the intercooler core. None is siphoned off for the airbox anymore.

In essence, the airbox gets its own air from the cheap bastard scoop, and nowhere else. The intercooler gets its cold air from the intercooler duct and nothing feeds off it anymore.

I basically copied how the 1999-2001 FD's front plastics were redesigned, and modified my 1992 plastics to do the same job. My car runs better and cooler for it.

i have an ARC intake box for $200 you could buy off me , meets all your connections of your stock box but with two air filters and ducting work inside

heres a link to some pics and my ad on the forum if your interested
https://www.rx7club.com/canadian-sal...parts-1040506/

I just bought the greddy airnix twin intake setup from a forum member. Is it any good? Better than stock airbox? Any advice would be great.

I've got the similar HKS filters and what I dislike about them is that they sit right above the radiator and suck in all the hot air.

That's not good. How do you fix that? Upgrade cooling system to larger radiator? What are some upgrades for radiator while mounting to stock location?

i have the pettit racing intake, it has a panel to not suck in the hot air from the engine compartment

Open filters suck hot air from the engine compartment. Even with a heat shield, the air under the hood is hot, and that's what your intake gets with open filters. A properly modified stock box is much better. You want cool air coming into your intake. You won't get cool air with an open intake.

To answer your question: NO, its not any good.

Upgrading the radiator on these cars is never a bad idea. There are a lot of options out there, but that is a different subject.

For any open element filter, like the airinx, ducting is what makes all the difference. It's what feeds fresh cold air to the filters rather than sucking in the surrounding heated engine bay air.

I'm assuming you still have the stock configuration for the radiator and the oem intercooler. In that case seal the opening in the top of the intercooler duct that previously fed the air box. Second chose a location and start ducting fresh air to your filters. Options include fitting a slotted ducted along the side of the radiator, if you are using the stock radiator peel off the sponge-y foam along the side of the radiator and mold or bend a duct to scoop air from the front of the car. Another option is to duct air from where the passenger side oil cooler sits if you don't have an "r" model.

The "shield" people refer to is a barrier fashioned between the air intakes and the oem or stock mount intercooler. This helps prevent the hot engine air from being sucked in from the side.

Its a 1992 type r so I believe I have the twin oil coolers.